Date

“Collection” Methods

_.map(collection, [iteratee=_.identity])

source npm package

Creates an array of values by running each element in collection thru iteratee. The iteratee is invoked with three arguments:
(value, index|key, collection).

Many lodash methods are guarded to work as iteratees for methods like _.every, _.filter, _.map, _.mapValues, _.reject, and _.some.

The guarded methods are:
ary, chunk, curry, curryRight, drop, dropRight, every, fill, invert, parseInt, random, range, rangeRight, repeat, sampleSize, slice, some, sortBy, split, take, takeRight, template, trim, trimEnd, trimStart, and words





引入版本

0.1.0

参数
collection (Array|Object) : The collection to iterate over.
[iteratee=_.identity] (Function) : The function invoked per iteration.

返回值
(Array) : Returns the new mapped array.

示例
function square(n) {
  return n * n;
}
 
_.map([4, 8], square);
// => [16, 64]
 
_.map({ 'a'4, 'b'8 }, square);
// => [16, 64] (iteration order is not guaranteed)
 
var users = [
  { 'user''barney' },
  { 'user''fred' }
];
 
// The `_.property` iteratee shorthand.
_.map(users, 'user');
// => ['barney', 'fred']